1. ***I*** don't open carry, because I don't WANT to.
2. If it's legal, I don't CARE if somebody else does.
3. Neither you nor the police have to like LEGAL open carry. Neither you nor the police have to like open carriers. Neither you nor the police have to LIKE the law. You and they had DAMNED well better OBEY it.
4. What you did was pure harassment based not on any illegality on the victim's part, but rather prejudice on yours.
5. The victim had NO legal duty to remove his firearm, and seemingly did so SOLELY because of the intimidation precipitated by YOU.

The difference in your attitude and that of the average "social justice warrior" is vanishingly small.